title: Persistence of bone and mineral disorders 2 years after successful kidney transplantation.
abstract: BACKGROUND
  Studies that have conducted bone biopsies after kidney transplantation are scarce, and the results are conflicting.
  
  
  METHODS
  We evaluate the bone histomorphometry, in vitro proliferation, and alkaline phosphatase expression in osteoblasts isolated from bone biopsies from 27 kidney transplant patients. The patients had preserved renal function and were treated with the same immunosuppressive therapy, receiving a minimum dose of corticosteroids.
  
  
  RESULTS
  The biochemical analysis revealed that 41% of the patients presented with hypercalcemia, 26% presented with hypophosphatemia, and hypovitaminosis D was detected in 63%. The histomorphometric analysis showed a reduced trabecular number and increased trabecular separation, mineral apposition rate, and mineralization lag time, as well as higher osteoid surface, osteoblastic surface, resorption surface, and osteoclastic surface and a lower mineralizing surface, compared with the controls. Based on the TMV classification, bone turnover was normal in 48%, high in 26%, and low in 26% of patients. Bone mineralization was delayed in 48% of the patients, and 58% of the patients with hypovitaminosis D presented with delayed bone mineralization. Bone volume was low in 37% of the patients. The osteoblasts from patients exhibited a higher degree of proliferation compared with those from controls.
  
  
  CONCLUSIONS
  Eight-two percent of our patients presented with alterations in at least one of the TMV parameters. Persistence of hyperparathyroidism, hypovitaminosis D, and immunosuppressive drugs may have influenced osteoblast function, which would explain many of the bone alterations found in these patients.
authors.affiliation: Nephrology Division, Medical School, University of São Paulo, São Paulo, SP, Brasil.
authors.forename: Carolina L
authors.initials: CL
authors.lastname: Neves
authors.forename: Luciene M
authors.initials: LM
authors.lastname: dos Reis
authors.forename: Daniella G
authors.initials: DG
authors.lastname: Batista
authors.forename: Melani R
authors.initials: MR
authors.lastname: Custodio
authors.forename: Fabiana G
authors.initials: FG
authors.lastname: Graciolli
authors.forename: Rita de Cassia T
authors.initials: Rde C
authors.lastname: Martin
authors.forename: Katia R
authors.initials: KR
authors.lastname: Neves
authors.forename: Wagner V
authors.initials: WV
authors.lastname: Dominguez
authors.forename: Rosa M
authors.initials: RM
authors.lastname: Moyses
authors.forename: Vanda
authors.initials: V
authors.lastname: Jorgetti
mesh_terms: D000328:Adult; D000469:Alkaline Phosphatase / Q000378:metabolism; D001847:Bone Diseases / Q000209:etiology*; D002113:Calcification, Physiologic; D005260:Female; D006801:Humans; D006934:Hypercalcemia / Q000209:etiology*; D017674:Hypophosphatemia / Q000209:etiology*; D016030:Kidney Transplantation / Q000009:adverse effects*; D008297:Male; D008875:Middle Aged; D010281:Parathyroid Hormone / Q000097:blood; D011183:Postoperative Complications / Q000209:etiology; D014807:Vitamin D / Q000031:analogs & derivatives / Q000097:blood
chemical_list: D010281:Parathyroid Hormone; D014807:Vitamin D; C104450:25-hydroxyvitamin D; D000469:Alkaline Phosphatase